package com.bai.ruiji.Service.impl;

import com.bai.ruiji.Common.BaseContext;
import com.bai.ruiji.Common.CustomException;
import com.bai.ruiji.Service.*;
import com.bai.ruiji.mapper.OrdersMapper;
import com.bai.ruiji.pojo.*;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

/**
 * @author 27471
 * Time : 2022/10/15 15:39
 */
@Service
public class OrdersServiceImpl extends ServiceImpl<OrdersMapper, Orders> implements OrdersService {
    @Autowired
    private OrderDetailService orderDetailService;
    @Autowired
    private ShoppingService shoppingCartService;
    @Autowired
    private UserService userService;
    @Autowired
    private AddressBookService addressBookService;

    /**
     * 用户下单
     *
     * @param orders
     */
    @Override
    @Transactional//事务
    public void submit(Orders orders) {
        //获取用户id
        Long currentId = BaseContext.getCurrentId();
        //查询用户的购物车数据
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId, currentId);
        List<ShoppingCart> list = shoppingCartService.list(queryWrapper);
        if (list == null || list.size() == 0) {
            throw new CustomException("购物车为空不能下单");
        }
        //查询用户信息
        User user = userService.getById(currentId);
        //查询地址
        Long addressBookId = orders.getAddressBookId();
        AddressBook byId = addressBookService.getById(addressBookId);
        if (addressBookId == null) {
            throw new CustomException("地址信息为空");
        }

        //向订单表插入数据(1条)
        long id = IdWorker.getId();//订单号

        //原子操作，保证多线程情况下可以正常操作(线程安全)
        AtomicInteger amount = new AtomicInteger(0);

        List<OrderDetail> orderDetails = list.stream().map((item) -> {
            OrderDetail orderDetail = new OrderDetail();
            orderDetail.setOrderId(id);
            orderDetail.setNumber(item.getNumber());
            orderDetail.setDishFlavor(item.getDishFlavor());
            orderDetail.setDishId(item.getDishId());
            orderDetail.setSetmealId(item.getSetmealId());
            orderDetail.setName(item.getName());
            orderDetail.setImage(item.getImage());
            orderDetail.setAmount(item.getAmount());
            //multiply乘法
            amount.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());
            return orderDetail;
        }).collect(Collectors.toList());

        orders.setId(id);
        orders.setOrderTime(LocalDateTime.now());
        orders.setCheckoutTime(LocalDateTime.now());
        orders.setStatus(2);
        orders.setAmount(new BigDecimal(amount.get()));//总金额
        orders.setUserId(currentId);
        orders.setNumber(String.valueOf(id));
        orders.setUserName(user.getName());
        orders.setConsignee(byId.getConsignee());
        orders.setPhone(byId.getPhone());
        orders.setAddress((byId.getProvinceName() == null ? "" : byId.getProvinceName())
                + (byId.getCityName() == null ? "" : byId.getCityName())
                + (byId.getDistrictName() == null ? "" : byId.getDistrictName())
                + (byId.getDetail() == null ? "" : byId.getDetail()));
        this.save(orders);
        //向明细表插入数据(多条/一条)
        orderDetailService.saveBatch(orderDetails);
        //清空购物车
        shoppingCartService.remove(queryWrapper);
    }
}
